Get rid of all the library tags.

test/build/can_specify_output_directory_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library pub_tests;
-
 import 'package:path/path.dart' as path;
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   integration("can specify the output directory to build into", () {
     d.dir(appPath, [
       d.appPubspec(),
@@ skipping 11 matching lines @@
       d.dir("out", [
         d.dir("dir", [
           d.dir("web", [
             d.file("file.txt", "web")
           ]),
         ])
       ])
     ]).validate();
   });
 }